(function ($) {
    // 当domReady的时候开始初始化
    $(function () {
        var $wrap = $('#uploader'),
                // 图片容器
                $queue = $('<ul class="filelist"></ul>')
                .appendTo($wrap.find('.queueList')),
                // 状态栏，包括进度和控制按钮
                $statusBar = $wrap.find('.statusBar'),
                // 文件总体选择信息。
                $info = $statusBar.find('.info'),
                // 上传按钮
                $upload = $wrap.find('.uploadBtn'),
                // 没选择文件之前的内容。
                $placeHolder = $wrap.find('.placeholder'),
                $progress = $statusBar.find('.progress').hide(),
                // 添加的文件数量
                fileCount = 0,
                // 添加的文件总大小
                fileSize = 0,
                // 优化retina, 在retina下这个值是2
                ratio = window.devicePixelRatio || 1,
                // 缩略图大小
                thumbnailWidth = 110 * ratio,
                thumbnailHeight = 110 * ratio,
                // 可能有pedding, ready, uploading, confirm, done.
                state = 'pedding',
                // 所有文件的进度信息，key为file id
                percentages = {},
                // 判断浏览器是否支持图片的base64
                isSupportBase64 = (function () {
                    var data = new Image();
                    var support = true;
                    data.onload = data.onerror = function () {
                        if (this.width != 1 || this.height != 1) {
                            support = false;
                        }
                    }
                    data.src = "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==";
                    return support;
                })(),
                // 检测是否已经安装flash，检测flash的版本
                flashVersion = (function () {
                    var version;

                    try {
                        version = navigator.plugins[ 'Shockwave Flash' ];
                        version = version.description;
                    } catch (ex) {
                        try {
                            version = new ActiveXObject('ShockwaveFlash.ShockwaveFlash')
                                    .GetVariable('$version');
                        } catch (ex2) {
                            version = '0.0';
                        }
                    }
                    version = version.match(/\d+/g);
                    return parseFloat(version[ 0 ] + '.' + version[ 1 ], 10);
                })(),
                supportTransition = (function () {
                    var s = document.createElement('p').style,
                            r = 'transition' in s ||
                            'WebkitTransition' in s ||
                            'MozTransition' in s ||
                            'msTransition' in s ||
                            'OTransition' in s;
                    s = null;
                    return r;
                })(),
                // WebUploader实例
                uploader;

        if (!WebUploader.Uploader.support('flash') && WebUploader.browser.ie) {

            // flash 安装了但是版本过低。
            if (flashVersion) {
                (function (container) {
                    window['expressinstallcallback'] = function (state) {
                        switch (state) {
                            case 'Download.Cancelled':
                                alert('您取消了更新！')
                                break;

                            case 'Download.Failed':
                                alert('安装失败')
                                break;

                            default:
                                alert('安装已成功，请刷新！');
                                break;
                        }
                        delete window['expressinstallcallback'];
                    };

                    var swf = './expressInstall.swf';
                    // insert flash object
                    var html = '<object type="application/' +
                            'x-shockwave-flash" data="' + swf + '" ';

                    if (WebUploader.browser.ie) {
                        html += 'classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" ';
                    }

                    html += 'width="100%" height="100%" style="outline:0">' +
                            '<param name="movie" value="' + swf + '" />' +
                            '<param name="wmode" value="transparent" />' +
                            '<param name="allowscriptaccess" value="always" />' +
                            '</object>';

                    container.html(html);

                })($wrap);

                // 压根就没有安转。
            } else {
                $wrap.html('<a href="http://www.adobe.com/go/getflashplayer" target="_blank" border="0"><img alt="get flash player" src="http://www.adobe.com/macromedia/style_guide/images/160x41_Get_Flash_Player.jpg" /></a>');
            }

            return;
        } else if (!WebUploader.Uploader.support()) {
            alert('Web Uploader 不支持您的浏览器！');
            return;
        }

        // 实例化
        uploader = WebUploader.create({
            pick: {
                id: '#filePicker',
                label: '点击选择图片'
            },
            formData: {
                uid: 123
            },
            dnd: '#dndArea',
            paste: '#uploader',
            swf: 'js/Uploader.swf',
            chunked: false,
            chunkSize: 512 * 1024,
            server: 'upload.php',
            // runtimeOrder: 'flash',

            // accept: {
            //     title: 'Images',
            //     extensions: 'gif,jpg,jpeg,bmp,png',
            //     mimeTypes: 'image/*'
            // },

            // 禁掉全局的拖拽功能。这样不会出现图片拖进页面的时候，把图片打开。
            disableGlobalDnd: true,
            fileNumLimit: 10,
            fileSizeLimit: 200 * 1024 * 1024, // 200 M
            fileSingleSizeLimit: 50 * 1024 * 1024    // 50 M
        });

        // 拖拽时不接受 js, txt 文件。
        uploader.on('dndAccept', function (items) {
            var denied = false,
                    len = items.length,
                    i = 0,
                    // 修改js类型
                    unAllowed = 'text/plain;application/javascript ';

            for (; i < len; i++) {
                // 如果在列表里面
                if (~unAllowed.indexOf(items[ i ].type)) {
                    denied = true;
                    break;
                }
            }

            return !denied;
        });

        // uploader.on('filesQueued', function() {
        //     uploader.sort(function( a, b ) {
        //         if ( a.name < b.name )
        //           return -1;
        //         if ( a.name > b.name )
        //           return 1;
        //         return 0;
        //     });
        // });

        // 添加“添加文件”的按钮，
        uploader.addButton({
            id: '#filePicker2',
            label: '继续添加'
        });

        uploader.on('ready', function () {
            window.uploader = uploader;
        });

        // 当有文件添加进来时执行，负责view的创建
        function addFile(file) {
            var $li = $('<li id="' + file.id + '">' +
                    '<p class="title">' + file.name + '</p>' +
                    '<p class="imgWrap"></p>' +
                    '<p class="progress"><span></span></p>' +
                    '</li>'),
                    $btns = $('<div class="file-panel">' +
                            '<span class="cancel">删除</span>' +
                            '<span class="rotateRight">向右旋转</span>' +
                            '<span class="rotateLeft">向左旋转</span></div>').appendTo($li),
                    $prgress = $li.find('p.progress span'),
                    $wrap = $li.find('p.imgWrap'),
                    $info = $('<p class="error"></p>'),
                    showError = function (code) {
                        switch (code) {
                            case 'exceed_size':
                                text = '文件大小超出';
                                break;

                            case 'interrupt':
                                text = '上传暂停';
                                break;

                            default:
                                text = '上传失败，请重试';
                                break;
                        }

                        $info.text(text).appendTo($li);
                    };

            if (file.getStatus() === 'invalid') {
                showError(file.statusText);
            } else {
                // @todo lazyload
                $wrap.text('预览中');
                uploader.makeThumb(file, function (error, src) {
                    var img;

                    if (error) {
                        $wrap.text('不能预览');
                        return;
                    }

                    if (isSupportBase64) {
                        img = $('<img src="' + src + '">');
                        $wrap.empty().append(img);
                    } else {
                        $.ajax('../preview.php', {
                            method: 'POST',
                            data: src,
                            dataType: 'json'
                        }).done(function (response) {
                            if (response.result) {
                                img = $('<img src="' + response.result + '">');
                                $wrap.empty().append(img);
                            } else {
                                $wrap.text("预览出错");
                            }
                        });
                    }
                }, thumbnailWidth, thumbnailHeight);

                percentages[ file.id ] = [file.size, 0];
                file.rotation = 0;
            }

            file.on('statuschange', function (cur, prev) {
                if (prev === 'progress') {
                    $prgress.hide().width(0);
                } else if (prev === 'queued') {
                    $li.off('mouseenter mouseleave');
                    $btns.remove();
                }

                // 成功
                if (cur === 'error' || cur === 'invalid') {
                    console.log(file.statusText);
                    showError(file.statusText);
                    percentages[ file.id ][ 1 ] = 1;
                } else if (cur === 'interrupt') {
                    showError('interrupt');
                } else if (cur === 'queued') {
                    percentages[ file.id ][ 1 ] = 0;
                } else if (cur === 'progress') {
                    $info.remove();
                    $prgress.css('display', 'block');
                } else if (cur === 'complete') {
                    $li.append('<span class="success"></span>');
                }

                $li.removeClass('state-' + prev).addClass('state-' + cur);
            });

            $li.on('mouseenter', function () {
                $btns.stop().animate({height: 30});
            });

            $li.on('mouseleave', function () {
                $btns.stop().animate({height: 0});
            });

            $btns.on('click', 'span', function () {
                var index = $(this).index(),
                        deg;

                switch (index) {
                    case 0:
                        uploader.removeFile(file);
                        return;

                    case 1:
                        file.rotation += 90;
                        break;

                    case 2:
                        file.rotation -= 90;
                        break;
                }

                if (supportTransition) {
                    deg = 'rotate(' + file.rotation + 'deg)';
                    $wrap.css({
                        '-webkit-transform': deg,
                        '-mos-transform': deg,
                        '-o-transform': deg,
                        'transform': deg
                    });
                } else {
                    $wrap.css('filter', 'progid:DXImageTransform.Microsoft.BasicImage(rotation=' + (~~((file.rotation / 90) % 4 + 4) % 4) + ')');
                    // use jquery animate to rotation
                    // $({
                    //     rotation: rotation
                    // }).animate({
                    //     rotation: file.rotation
                    // }, {
                    //     easing: 'linear',
                    //     step: function( now ) {
                    //         now = now * Math.PI / 180;

                    //         var cos = Math.cos( now ),
                    //             sin = Math.sin( now );

                    //         $wrap.css( 'filter', "progid:DXImageTransform.Microsoft.Matrix(M11=" + cos + ",M12=" + (-sin) + ",M21=" + sin + ",M22=" + cos + ",SizingMethod='auto expand')");
                    //     }
                    // });
                }


            });

            $li.appendTo($queue);
        }

        // 负责view的销毁
        function removeFile(file) {
            var $li = $('#' + file.id);

            delete percentages[ file.id ];
            updateTotalProgress();
            $li.off().find('.file-panel').off().end().remove();
        }

        function updateTotalProgress() {
            var loaded = 0,
                    total = 0,
                    spans = $progress.children(),
                    percent;

            $.each(percentages, function (k, v) {
                total += v[ 0 ];
                loaded += v[ 0 ] * v[ 1 ];
            });

            percent = total ? loaded / total : 0;


            spans.eq(0).text(Math.round(percent * 100) + '%');
            spans.eq(1).css('width', Math.round(percent * 100) + '%');
            updateStatus();
        }

        function updateStatus() {
            var text = '', stats;

            if (state === 'ready') {
                text = '选中' + fileCount + '张图片，共' +
                        WebUploader.formatSize(fileSize) + '。';
            } else if (state === 'confirm') {
                stats = uploader.getStats();
                if (stats.uploadFailNum) {
                    text = '已成功上传' + stats.successNum + '张照片至XX相册，' +
                            stats.uploadFailNum + '张照片上传失败，<a class="retry" href="#">重新上传</a>失败图片或<a class="ignore" href="#">忽略</a>'
                }

            } else {
                stats = uploader.getStats();
                text = '共' + fileCount + '张（' +
                        WebUploader.formatSize(fileSize) +
                        '），已上传' + stats.successNum + '张';

                if (stats.uploadFailNum) {
                    text += '，失败' + stats.uploadFailNum + '张';
                }
            }

            $info.html(text);
        }

        function setState(val) {
            var file, stats;

            if (val === state) {
                return;
            }

            $upload.removeClass('state-' + state);
            $upload.addClass('state-' + val);
            state = val;

            switch (state) {
                case 'pedding':
                    $placeHolder.removeClass('element-invisible');
                    $queue.hide();
                    $statusBar.addClass('element-invisible');
                    uploader.refresh();
                    break;

                case 'ready':
                    $placeHolder.addClass('element-invisible');
                    $('#filePicker2').removeClass('element-invisible');
                    $queue.show();
                    $statusBar.removeClass('element-invisible');
                    uploader.refresh();
                    break;

                case 'uploading':
                    $('#filePicker2').addClass('element-invisible');
                    $progress.show();
                    $upload.text('暂停上传');
                    break;

                case 'paused':
                    $progress.show();
                    $upload.text('继续上传');
                    break;

                case 'confirm':
                    $progress.hide();
                    $('#filePicker2').removeClass('element-invisible');
                    $upload.text('开始上传');

                    stats = uploader.getStats();
                    if (stats.successNum && !stats.uploadFailNum) {
                        setState('finish');
                        return;
                    }
                    break;
                case 'finish':
                    stats = uploader.getStats();
                    if (stats.successNum) {
                        alert('上传成功');
                    } else {
                        // 没有成功的图片，重设
                        state = 'done';
                        location.reload();
                    }
                    break;
            }

            updateStatus();
        }

        uploader.onUploadProgress = function (file, percentage) {
            var $li = $('#' + file.id),
                    $percent = $li.find('.progress span');

            $percent.css('width', percentage * 100 + '%');
            percentages[ file.id ][ 1 ] = percentage;
            updateTotalProgress();
        };

        uploader.onFileQueued = function (file) {
            fileCount++;
            fileSize += file.size;

            if (fileCount === 1) {
                $placeHolder.addClass('element-invisible');
                $statusBar.show();
            }

            addFile(file);
            setState('ready');
            updateTotalProgress();
        };

        uploader.onFileDequeued = function (file) {
            fileCount--;
            fileSize -= file.size;

            if (!fileCount) {
                setState('pedding');
            }

            removeFile(file);
            updateTotalProgress();

        };

        uploader.on('all', function (type) {
            var stats;
            switch (type) {
                case 'uploadFinished':
                    setState('confirm');
                    break;

                case 'startUpload':
                    setState('uploading');
                    break;

                case 'stopUpload':
                    setState('paused');
                    break;

            }
        });

        uploader.onError = function (code) {
            alert('Eroor: ' + code);
        };

        $upload.on('click', function () {
            if ($(this).hasClass('disabled')) {
                return false;
            }

            if (state === 'ready') {
                uploader.upload();
            } else if (state === 'paused') {
                uploader.upload();
            } else if (state === 'uploading') {
                uploader.stop();
            }
        });

        $info.on('click', '.retry', function () {
            uploader.retry();
        });

        $info.on('click', '.ignore', function () {
            alert('todo');
        });

        $upload.addClass('state-' + state);
        updateTotalProgress();
    });

})(jQuery);